28072947 has 16 divisors (see below), whose sum is σ = 42861312. Its totient is φ = 16010400.

The previous prime is 28072943. The next prime is 28072951. The reversal of 28072947 is 74927082.

It is an interprime number because it is at equal distance from previous prime (28072943) and next prime (28072951).

It is not a de Polignac number, because 28072947 - 2² = 28072943 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28072943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13768 + ... + 15674.

It is an arithmetic number, because the mean of its divisors is an integer number (2678832).

Almost surely, 2^28072947 is an apocalyptic number.

28072947 is a deficient number, since it is larger than the sum of its proper divisors (14788365).

28072947 is a wasteful number, since it uses less digits than its factorization.

28072947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2618.

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 28072947 is about 5298.3909821756. The cubic root of 28072947 is about 303.9223709621.

The spelling of 28072947 in words is "twenty-eight million, seventy-two thousand, nine hundred forty-seven".